Global Patent Index - EP 3279895 A1

EP 3279895 A1 20180207 - AUDIO ENCODING BASED ON AN EFFICIENT REPRESENTATION OF AUTO-REGRESSIVE COEFFICIENTS

Title (en)

AUDIO ENCODING BASED ON AN EFFICIENT REPRESENTATION OF AUTO-REGRESSIVE COEFFICIENTS

Title (de)

TONCODIERUNG AUF BASIS EINER EFFIZIENTEN DARSTELLUNG VON AUTO-REGRESSIVEN KOEFFIZIENTEN

Title (fr)

CODAGE AUDIO BASÉ SUR UNE REPRÉSENTATION EFFICACE DES COEFFICIENTS AUTORÉGRESSIFS

Publication

EP 3279895 A1 20180207 (EN)

Application

EP 17190535 A 20120515

Priority

  • US 201161554647 P 20111102
  • EP 16156708 A 20120515
  • EP 12846533 A 20120515
  • SE 2012050520 W 20120515

Abstract (en)

Described is an apparatus (40) for encoding a parametric spectral representaton ( f ) of auto-regressive coefficients that partially represent an audio signal. The apparatus comprises means (10) for quantizing coefficients of a part of the parametric spectral representation that correspond to a low-frequency part of the audio signal. It also comprises means (12) for encoding a high-frequency part ( f H ) of the parametric spectral representation ( f ) by weighted averaging based on the quantized coefficients ( f L ) flipped around a quantized mirroring frequency ( f m ), which separates the low-frequency part from the high-frequency part, and a frequency grid determined from a frequency grid codebook (24) in a closed-loop search procedure. Described are also a corresponding decoder, corresponding encoding/decoding methods and user equipments comprising such an encoder/decoder.

IPC 8 full level

G10L 19/06 (2013.01); G10L 19/032 (2013.01); G10L 21/038 (2013.01); G10L 19/02 (2013.01)

CPC (source: EP US)

G10L 19/0204 (2013.01 - EP US); G10L 19/032 (2013.01 - EP US); G10L 19/038 (2013.01 - US); G10L 19/06 (2013.01 - EP US); G10L 21/038 (2013.01 - EP US); G10L 2019/001 (2013.01 - US)

Citation (applicant)

  • EP 1818913 A1 20070815 - MATSUSHITA ELECTRIC IND CO LTD [JP]
  • "Adaptive Multi-Rate (AMR) speech codec; Trans-coding functions", 3GPP TS 26.090, 2007, pages 13
  • N. IWAKAMI ET AL.: "High-quality audio-coding at less than 64 kbit/s by using transform-domain weighted interleave vector quantization (TWINVQ", IEEE ICASSP, vol. 5, 1995, pages 3095 - 3098, XP010151999, DOI: doi:10.1109/ICASSP.1995.479500
  • J. MAKHOUL: "Linear prediction: A tutorial review", PROC. IEEE, vol. 63, 1975, pages 566
  • P. KABAL; R.P. RAMACHANDRAN: "The computation of line spectral frequencies using Chebyshev polynomials", IEEE TRANS. ON ASSP, vol. 34, no. 6, 1986, pages 1419 - 1426, XP002066603, DOI: doi:10.1109/TASSP.1986.1164983

Citation (search report)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DOCDB simple family (publication)

WO 2013066236 A2 20130510; WO 2013066236 A3 20130711; AU 2012331680 A1 20140522; AU 2012331680 B2 20160303; BR 112014008376 A2 20170418; BR 112014008376 B1 20210105; CN 103918028 A 20140709; CN 103918028 B 20160914; DK 3040988 T3 20180108; EP 2774146 A2 20140910; EP 2774146 A4 20150513; EP 2774146 B1 20160706; EP 3040988 A1 20160706; EP 3040988 B1 20171025; EP 3279895 A1 20180207; EP 3279895 B1 20190710; ES 2592522 T3 20161130; ES 2657802 T3 20180306; ES 2749967 T3 20200324; NO 2737459 T3 20180908; PL 3040988 T3 20180330; PL 3279895 T3 20200331; US 11011181 B2 20210518; US 11594236 B2 20230228; US 2014249828 A1 20140904; US 2016155450 A1 20160602; US 2020243098 A1 20200730; US 2021201924 A1 20210701; US 2023178087 A1 20230608; US 9269364 B2 20160223

DOCDB simple family (application)

SE 2012050520 W 20120515; AU 2012331680 A 20120515; BR 112014008376 A 20120515; CN 201280053667 A 20120515; DK 16156708 T 20120515; EP 12846533 A 20120515; EP 16156708 A 20120515; EP 17190535 A 20120515; ES 12846533 T 20120515; ES 16156708 T 20120515; ES 17190535 T 20120515; NO 12818353 A 20120726; PL 16156708 T 20120515; PL 17190535 T 20120515; US 201214355031 A 20120515; US 201614994561 A 20160113; US 202016832597 A 20200327; US 202117199869 A 20210312; US 202318103871 A 20230131